Ethyl Corporation

Genevieve S Lum

Hsueh M Li

F Alexander Pettigrew

Conrad J Langlois, Jr

Preceramic compositions which have particular utility in providing protective ceramic coatings on normally oxidizable materials, such as carbon/carbon and other carbon-containing composites and other materials, are obtained by dispersing solid particles comprising aluminum nitride particles in an organic solvent solution of a polysilazane. Ceramic coatings derived from the dispersions may serve as intermediate strata in multilayer ceramic coatings over substrates, such as carbon/ carbon composites, to provide even greater protection to the substrates, even when exposed to humidity.

Preceramic composition and ceramic product

Preceramic compositions which have particular utility in providing protective ceramic coatings on normally oxidizable materials, such as carbon/silicon carbide and other carbon-containing composites and other materials, are obtained by dispersing solid particles comprising aluminum nitride particles in an organic solvent solution of an organoborosilazane polymer obtainable by reacting about 0.25-20 parts by weight of a trialkoxy-, triaryloxy-, or tri(arylalkoxy)boroxine with one part by weight of a polysilazane in an organic solvent. Ceramic coatings derived from the dispersions may be overcoated with ceramics derived from other preceramic polysilazane compositions to provide even greater protection to the substrates.

A magnetic recording media containing a normally liquid polyphosphazene lubricant, e.g. low molecular weight linear or cyclic poly-fluoroalkoxy phosphazene mixtures.

Polyphosphazene magnetic tape lube

One or a mixture of compounds of the formula:

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Baton Rouge, LA, United States of America

Genevieve S Lum